Calibration - Slope And Offset; Temperature And Pressure Compensation (Tpc) Feature; Figure 12-25: Calibration Slope And Offset - Teledyne t100 Operation Manual

Teledyne API - T100 UV Fluorescence SO
12.7.2.

CALIBRATION - SLOPE AND OFFSET

SAMPLE RANGE = 500.000 PPB
< TST TST > CAL
SAMPLE TIME = HH:MM:SS
< TST TST > CAL
SAMPLE PMT TEMP=0.0C
< TST TST > CAL
SAMPLE BOX TEMP=0.0C
< TST TST > CAL
12.7.3.

TEMPERATURE AND PRESSURE COMPENSATION (TPC) FEATURE

06807F DCN7335
Analyzer
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amount. Second, the instantaneous concentration must exceed the average in the long
filter by a portion, or percentage, of the average in the long filter.
If necessary, the filter lengths of these two modes may be changed to any value between
1 and 1000 samples. Long sample lengths provide better signal-to-noise rejection, but
poor response times. Conversely, shorter filter lengths result in poor signal-to-noise
rejection, but quicker response times.
Calibration of the analyzer is performed exclusively in software. During instrument
calibration (refer to Section 90) the user enters expected values for zero and span
through the front panel touch-screen control buttons and commands the instrument to
make readings of sample gases with known concentrations of SO
are adjusted, linearized, and compared to the expected values as input. With this
information the software computes values for both slope and offset and stores these
values in memory for use in calculating the SO
Instrument slope and offset values recorded during the last calibration can be viewed by
pressing the following control buttons sequence:
SO2 =XXX.X
SETUP
SO2 =XXX.X
SETUP
SO2 =XXX.X
SETUP
SO2 =XXX.X
SETUP

Figure 12-25: Calibration Slope and Offset

As explained in the principles of operation, changes in temperature can significantly
affect the amount of fluoresced UV light generated in the instrument's sample chamber.
To negate this effect the T100 maintains the sample gas at a stable, raised temperature.
Pressure changes can also have a noticeable, if more subtle, effect on the SO
concentration calculation. To account for this, the T100 software includes a feature that
allows the instrument to compensate changes in ambient pressure during the SO
calculations.
concentration of the sample gas.
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SAMPLE RCELL TEMP=0.0C
< TST TST > CAL
SAMPLE HVPS 553 VOLTS
< TST TST > CAL
SAMPLE OFFSET=XX.X MV
< TST TST > CAL
SAMPLE SLOPE=XXX
< TST TST > CAL
Principles of Operation
. The readings taken
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SO2 =XXX.X
SETUP
SO2 =XXX.X
SETUP
SO2 =XXX.X
SETUP
SO2 =XXX.X
SETUP
299
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